JPH0495241A - Optical disk - Google Patents

Optical disk

Info

Publication number
JPH0495241A
JPH0495241A JP2212836A JP21283690A JPH0495241A JP H0495241 A JPH0495241 A JP H0495241A JP 2212836 A JP2212836 A JP 2212836A JP 21283690 A JP21283690 A JP 21283690A JP H0495241 A JPH0495241 A JP H0495241A
Authority
JP
Japan
Prior art keywords
film layer
layer
temperature
shape
shape memory
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2212836A
Other languages
Japanese (ja)
Inventor
Yoshihiko Sakai
坂井 義彦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP2212836A priority Critical patent/JPH0495241A/en
Publication of JPH0495241A publication Critical patent/JPH0495241A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To attain the writing and erasing operations together with a rewriting operation with an optical disk by holding a shape memory alloy film layer storing a projection shape and a thin film layer which has both releasing and adhesive properties by the temperatures among a protective film layer, an aluminum reflective layer, and a transmissive layer of the disk respectively. CONSTITUTION:A shape memory alloy film layer 2 is provided between a reflective film layer 4 and a protective film layer 1 and stores a projection shape at a certain temperature. A thin film layer 3 has the temperatures to secure the releasing and adhesive properties respectively. The signals are written when an optical disk is heated by the laser light 7 at a temperature where the shape stored in the layer 2 is formed and up to a temperature where the layer 3 shows the releasing properties. Then the signals are erased when the disk is heated at the temperature where the shape stored in the layer 2 is formed and up to a temperature where the layer 3 shows the adhesive properties respectively. Thus a physical pit can be produced and erased on an aluminum reflective layer of the optical disk and therefore the information can be freely rewritten.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、情報機器関連の補助記憶装置に用いる書き替
え型の光デイヌクに関する。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rewritable optical decoder for use in an auxiliary storage device related to information equipment.

従来の技術 情報機器の処理能力の増大や取シ扱う情報量の増大など
により、補助記憶装置の記憶容量は日々増加している。
The storage capacity of auxiliary storage devices is increasing day by day due to increases in the processing power of conventional technical information devices and the amount of information they handle.

そのため、現在ある補助記憶装置にかわり、よりコンパ
クトでより大記憶容量の可能性を秘めている光ディスク
に注目が集まってきた。
For this reason, attention has been focused on optical disks, which are more compact and have the potential for larger storage capacity, in place of the current auxiliary storage devices.

以下に従来の光ディスクについて説明する。A conventional optical disc will be explained below.

第8図は、従来の再生専用光ディスク(コンパクトディ
スクと称されるもの)の断面を示した図であり、透過層
(基板)14上にピット16を形成し、アルミニウム膜
の反射層13とアルミニウムを酸化から護る保護層12
とで構成されている。
FIG. 8 is a diagram showing a cross section of a conventional read-only optical disc (referred to as a compact disc), in which pits 16 are formed on a transmission layer (substrate) 14, and a reflective layer 13 of an aluminum film and an aluminum Protective layer 12 that protects from oxidation
It is made up of.

ピット16は透過層14に刻まれた窪で、記憶信号の構
成要素である。16は信号の読み取り方向、つまシ、半
導体レーザが入射する方向を示している矢印である。
Pit 16 is a depression cut into transparent layer 14 and is a component of a storage signal. Reference numeral 16 denotes an arrow indicating the signal reading direction, the tab, and the direction in which the semiconductor laser is incident.

以上の様な構成状態の光ディスクについて、以下にその
構成を説明する。
The configuration of the optical disc configured as described above will be explained below.

16の矢印側よシ入射したレーザ光は、透過層14を通
過後、保護膜層12上(透過層14と保護膜層12の間
)に形成されたアルミの反射膜層13により反射させら
れる、その際、ピット15に光が当たるとピット15に
よる光の回折と干渉により、入射したレーザ光の反射状
態がピットのない部分でのレーザ光の反射状態と異なる
ことになる。この差異を検出することにより記憶されて
いる信号(情報)を読み取ることができる。
After passing through the transmission layer 14, the laser light incident from the direction of the arrow 16 is reflected by the aluminum reflective film layer 13 formed on the protective film layer 12 (between the transmission layer 14 and the protective film layer 12). At this time, when light hits the pits 15, the diffraction and interference of the light by the pits 15 causes the reflected state of the incident laser light to be different from the reflected state of the laser light in a portion without pits. By detecting this difference, the stored signal (information) can be read.

発明が解決しようとする課題 このような従来の構成では光デイスク作成段階でピット
13も同時に作成されてしまうため、できあがった光デ
イヌクは読み出し専用の光ディスクとなってしまい、書
き込みや消去ができない、つまシ、書換えができないと
いう問題点を有している。
Problems to be Solved by the Invention In such a conventional configuration, the pits 13 are also created at the same time as the optical disc creation stage, so the completed optical disc becomes a read-only optical disc, which cannot be written or erased. However, it has the problem that it cannot be rewritten.

本発明は、このような課題を解決するもので光ディスク
の反射膜層上に物理的なピットの生成・消去を行い、物
理的な変化により光ディスクへの情報の記録・再生・消
去が可能な光ディスクを提供することを目的とするもの
であ、る。
The present invention solves these problems by creating and erasing physical pits on the reflective film layer of an optical disc, and provides an optical disc that allows information to be recorded, reproduced, and erased on the optical disc through physical changes. The purpose is to provide

課題を解決するための手段 この課題を解決するために本発明は、保護膜層。Means to solve problems In order to solve this problem, the present invention provides a protective film layer.

反射膜層そして透過層の3層構造で、かつ、反射膜層上
に予めピットが作成されている再生専用光ディスク(コ
ンパクトディスク)の代りに、保護膜層と、ある温度で
突起状の形状を記憶する形状記憶合金膜層と、温度の違
いにより剥離性と粘着性の両性質を合わせ持つ薄膜層と
、アルミニウムの反射膜層そして透過層の6層に、よシ
書換え可能な光ディスクを構成したものである。
Instead of a read-only optical disc (compact disc), which has a three-layer structure of a reflective film layer and a transparent layer, and pits are created in advance on the reflective film layer, a protective film layer and a projection-like shape are formed at a certain temperature. A rewritable optical disc is made up of six layers: a shape memory alloy film layer, a thin film layer that has both removability and adhesive properties depending on temperature differences, an aluminum reflective film layer, and a transparent layer. It is something.

作  用 このi成により、光ディスクのアルミニウムの反射膜層
上に物理的なピントの生成・消去が可能となるために、
情報の自由な書換えができることとなる。
Function: This i-formation makes it possible to physically create and erase a focus on the aluminum reflective film layer of the optical disc.
This allows information to be freely rewritten.

実施例 第1図に本発明の一実施例における光ディスクの構成を
示す。保護膜層1.形状記憶合金膜層2゜薄膜層3.ア
ルミニウムの反射膜層4.透過層5とで構成される。レ
ーザ光の入射方向を矢印6で示す。第2図および第3図
は、書き込み(情報の記録)時の光ディスクの状態を示
した図である。
Embodiment FIG. 1 shows the configuration of an optical disc in an embodiment of the present invention. Protective film layer 1. Shape memory alloy film layer 2゜thin film layer 3. Aluminum reflective film layer 4. It is composed of a transparent layer 5. The direction of incidence of the laser beam is indicated by an arrow 6. FIGS. 2 and 3 are diagrams showing the state of the optical disc at the time of writing (recording information).

書き込み用の入射レーザ光7が形状記憶合金膜を加熱し
形状記憶合金膜上の突起記憶部分8を形成する突起記憶
部分8に隣接する薄膜層部分9があシ、アルミニウムの
反射膜層4上にピット1oが生成される。第4図および
第5図は、消去(情報の削除)時の光ディスクの状態を
示した図である。
The incident laser beam 7 for writing heats the shape memory alloy film to form a protrusion memory portion 8 on the shape memory alloy film.A thin film layer portion 9 adjacent to the protrusion memory portion 8 is formed on the aluminum reflective film layer 4. A pit 1o is generated. FIGS. 4 and 5 are diagrams showing the state of the optical disc at the time of erasure (deletion of information).

11は消去時の入射レーザ光、10’は反射膜層上のピ
ット(情報の記録)が消去された状態を示している。
Reference numeral 11 indicates the incident laser beam during erasing, and 10' indicates a state in which pits (recorded information) on the reflective film layer have been erased.

以上のように構成された光ディスクについて、その書き
込み、消去動作を以下に説明する。
The writing and erasing operations for the optical disc configured as described above will be described below.

保護膜層1の片側に形状記憶合金膜層2を重ねる、つぎ
に、形状記憶合金膜層2の上に薄膜層3を重ねる、さら
に薄膜層3の上にアルミニウムの反射膜層を重ねて形成
する。矢印6の方向よシ、書き込みレーザ光7を入射さ
せる。入射したレーザ光によって照射された形状記憶合
金膜層2の突起記憶部分8の温度が形状記憶温度を越え
るので、突起記憶部分8が第2図に示すように記憶して
いた突起形状へと変形する。その変形した突起記憶部分
8により、突起記憶部分8に接する薄膜層3の9の部分
とアルミニウムの反射膜層4の10の部分が、第2図に
示すように突き出される。レーザ光の入射が終了すると
、突起記憶部分8の温度は形状記憶温度以下に低下する
ために、突起記憶部分8の形状は第3図に示すように定
常時(常温時)の形状にもどることになる。このとき、
薄膜層9の温度が剥離性を示す温度になるように入射レ
ーザ光7を制御する。その結果、第3図に示すように突
起記憶部分8に従って薄膜層部分9ももとの平坦な状態
に戻9、結果として第3図のアルミニウムの反射膜層1
0だけがピットを形成したまま残シ、情報の書き込み(
情報の記録)がなされたことになる。
A shape memory alloy film layer 2 is stacked on one side of the protective film layer 1, then a thin film layer 3 is stacked on top of the shape memory alloy film layer 2, and an aluminum reflective film layer is further stacked on top of the thin film layer 3. do. A writing laser beam 7 is made incident in the direction of an arrow 6. Since the temperature of the protrusion memory portion 8 of the shape memory alloy film layer 2 irradiated by the incident laser beam exceeds the shape memory temperature, the protrusion memory portion 8 deforms into the memorized protrusion shape as shown in FIG. do. Due to the deformed protrusion memory portion 8, a portion 9 of the thin film layer 3 and a portion 10 of the aluminum reflective film layer 4 which are in contact with the protrusion memory portion 8 are protruded as shown in FIG. When the incidence of the laser beam ends, the temperature of the protrusion memory portion 8 falls below the shape memory temperature, so that the shape of the protrusion memory portion 8 returns to its normal state (at normal temperature) as shown in FIG. become. At this time,
The incident laser beam 7 is controlled so that the temperature of the thin film layer 9 becomes a temperature that exhibits releasability. As a result, as shown in FIG. 3, the thin film layer portion 9 returns to its original flat state according to the protrusion memory portion 8, and as a result, the aluminum reflective film layer 1 of FIG.
Only 0 remains as a pit, and information is written (
(recording of information) has been made.

つぎに第4図に示すように消去用のレーザ光を入射する
と、第2図と同様に形状記憶部分8は形状記憶温度に達
し、薄膜層9を押し出しアルミニウムの反射膜層10へ
と押し付ける形で突起記憶部分8は記憶している突起形
状へと変形する。この際、書き込み時のレーザ光7よシ
も消去時のし−ザ光11の出力を大きくしておき、薄膜
層9が粘着性を現わす状態に加熱する。すると薄膜層9
はアルミニウムの反射膜層1oに接着することになる。
Next, as shown in FIG. 4, when a laser beam for erasing is applied, the shape memory portion 8 reaches the shape memory temperature as shown in FIG. Then, the protrusion memory portion 8 deforms into the memorized protrusion shape. At this time, the output of the laser beam 7 during writing and the laser beam 11 during erasing are increased, and the thin film layer 9 is heated to a state where it becomes sticky. Then the thin film layer 9
will be adhered to the aluminum reflective film layer 1o.

その後、消去用レーザ11の照射を中止し、突起記憶部
分8の突起形状が定常時の平坦の形状に戻る際、突起の
戻りとともに薄膜層9がアルミニウムの反射膜層10を
引き込み、第5図に示す定常時の形状であるアルミニウ
ムの反射膜層状態10aにしてしまい、結果として情報
の消去(情報の削除)がなされたことになる。
Thereafter, when the irradiation of the erasing laser 11 is stopped and the protrusion shape of the protrusion memory portion 8 returns to its normal flat shape, the thin film layer 9 pulls in the aluminum reflective film layer 10 as the protrusion returns, as shown in FIG. The state of the aluminum reflective film layer 10a, which is the steady state shown in FIG.

つぎに、本発明の一実施例である光ディスクの製造方法
を第6図および第7図を用いて説明する。
Next, a method for manufacturing an optical disc, which is an embodiment of the present invention, will be explained with reference to FIGS. 6 and 7.

一般にコンパクトディスクの製造に用いられる方法でメ
タルマスクを作成する。
A metal mask is created using a method generally used for manufacturing compact discs.

このメタルマスタを使用して、上下のメタルマザーを同
様にメツキしてつくシ、このメタルマザーの上にニッケ
ル霊前をほどこして上下のスタンパをつくる。
Using this metal master, plate the upper and lower metal motherboards in the same way, and then apply nickel coating on top of the metal motherboards to create the upper and lower stampers.

第6図(a)〜(d)は、形状記憶合金膜への形状記憶
工程の方法の概略を示しておシ、第7図(a)〜(d)
は、形状を記憶した形状記憶合金を使用した本発明の光
ディスクの製造方法の概略を示している。
FIGS. 6(a) to (d) schematically show the method of shape memory process for shape memory alloy film, and FIGS. 7(a) to (d)
1 shows an outline of a method for manufacturing an optical disc of the present invention using a shape memory alloy that memorizes a shape.

前記の方法によって作成された第6図(a)に示す上ス
タンパ21と、その上スタンパ21に対応して、嵌合す
るように作られた下スタンパ22との間に形状記憶合金
膜2aを、はさみ込み、形状記憶合金膜2aを第6図(
b)に示すようにスタンピングする。ただし、このスタ
ンピングの際、形状記憶合金を形状記憶温度T1  に
保持した状態で上スタンパ21と下スタンパ22の間に
挟んでスタンピングする。この操作によシ形状記憶合金
膜2bは形状記憶温度T1 での形状を記憶する。悌6
図(C))。
A shape memory alloy film 2a is provided between the upper stamper 21 shown in FIG. 6(a) produced by the method described above and the lower stamper 22 made to fit with the upper stamper 21. , insert the shape memory alloy film 2a in FIG. 6 (
Stamping as shown in b). However, during this stamping, the shape memory alloy is sandwiched between the upper stamper 21 and the lower stamper 22 while being held at the shape memory temperature T1. By this operation, the shape memory alloy film 2b memorizes the shape at the shape memory temperature T1.悌6
Figure (C)).

スタンパ21.22よシとシ出し常温に置いた形状記憶
合金膜2第6図(d)は平坦な状態にもどるが、形状記
憶温度τ1でのスタンパの形状を記憶している。
The shape memory alloy film 2 (FIG. 6(d)), which is removed from the stamper 21 and 22 and placed at room temperature, returns to a flat state, but still remembers the shape of the stamper at the shape memory temperature τ1.

このようにして作成した形状記憶膜2を用いて第7図(
a)〜伽)に示す工程で光ディスクを作成する。
Using the shape memory film 2 created in this way, as shown in FIG.
An optical disc is created through the steps shown in a) to 伽).

すなわち、樹脂製の透過層6とにアルミニウムの反射膜
層4をうずく均一に蒸着する(第7図(a))。
That is, the reflective film layer 4 made of aluminum is uniformly deposited on the transparent layer 6 made of resin (FIG. 7(a)).

そして、アルミニウムの反射膜層4の上に温度の違いに
より粘着性を有する薄膜層3をコーティングしく第7図
(b))、その上に、第6図に示すスタンパ21.22
によりスタンパ21.22の形状をある温度T1にて記
憶させられた形状記憶合金膜層2を積層しく第7図(C
))、最後に、その形状記憶合金膜層2の上に、保護膜
層1を積層する(第7図(d))。
Then, a thin film layer 3 having adhesive properties due to the difference in temperature is coated on the aluminum reflective film layer 4 (FIG. 7(b)), and a stamper 21, 22 shown in FIG.
7 (C
)) Finally, the protective film layer 1 is laminated on the shape memory alloy film layer 2 (FIG. 7(d)).

以上の方法により、本発明の一実施例の光ディスクを製
作することができる。
By the above method, an optical disc according to an embodiment of the present invention can be manufactured.

発明の効果 以上の実施例の説明からも明らかなように本発明によれ
ば、光ディスクの保護膜層とアルミニウムの反射膜層と
透過層の間に突起状の形状を記憶した形状記憶合金膜層
と、温度の違いによシ剥離性と粘着性の両性質を別個に
現わす薄膜層とを挟むことによって、情報の書き込みお
よび、消去が可能な光ディスクを提供できる。
Effects of the Invention As is clear from the description of the embodiments above, according to the present invention, a shape memory alloy film layer that memorizes the shape of a protrusion is formed between the protective film layer of an optical disc, the reflective film layer of aluminum, and the transparent layer. and a thin film layer that separately exhibits both releasability and adhesive properties depending on temperature differences, it is possible to provide an optical disc on which information can be written and erased.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例の光ディスクの断面図、第2
図は同情報書き込み時の光ディスクの断面図、第3図は
同情報書き込み終了時の光ディスクの断面図、第4図は
同情報消去時の光ディスクの断面図、第6図は同情報消
去完了時の光ディスクの断面図、第6図は同形状記憶合
金膜層の製作工程図、第7図は同光ディスクの製造工程
図、第8図は従来の光ディスク(コンパクトディスク)
の断面図である。 1・・・・・・保護膜層、2,2a、2b・・・・・・
形状記憶合金膜tm、3・・・・・・薄膜層、4・・・
・・・アルミニウムの反射膜層、6・・・・・・透過層
、6・・・・・・レーザ光入射方向、7・・・・・・書
き込み時のレーザ光、8−・・・・・形状記憶合金膜層
中の突起記憶部分、9・・・・・・8に接する薄膜層、
1o・・・・・・反射膜層中に生成されるピット、10
a・・・・・・消去されたピット、11・・・・・・消
去時のレーザ光、21・・・・・・上スタンパ、22・
・・・・・下スタンパ。 代理人の氏名 弁理士 粟 野 重 孝 ほか1名 −
m− −m− 憚霞 R4 形基記情さまsm 漬霞層 アルミニウムの反酌s4 iFIMI層 し−ザ光入(方向 ?−11ごひJ+−のし−ザ兜 8− 形TK&!II吉M−尾中の瞥起ν惟部分9−−
−8に幀するlF腰層
FIG. 1 is a sectional view of an optical disk according to an embodiment of the present invention, and FIG.
The figure is a cross-sectional view of the optical disk when the same information is written, Figure 3 is a cross-sectional view of the optical disk when the same information has been written, Figure 4 is a cross-sectional view of the optical disk when the same information is erased, and Figure 6 is when the same information has been erased. 6 is a diagram showing the manufacturing process of the same shape memory alloy film layer, Figure 7 is a diagram showing the manufacturing process of the same optical disc, and Figure 8 is a conventional optical disc (compact disc).
FIG. 1...Protective film layer, 2, 2a, 2b...
Shape memory alloy film tm, 3... Thin film layer, 4...
... Aluminum reflective film layer, 6... Transmissive layer, 6... Laser light incident direction, 7... Laser light during writing, 8-...・Thin film layer in contact with the protrusion memory portion, 9...8 in the shape memory alloy film layer,
1o... pits generated in the reflective film layer, 10
a... Erased pit, 11... Laser light during erasing, 21... Upper stamper, 22...
...Lower stamper. Name of agent: Patent attorney Shigetaka Awano and 1 other person −
m- -m- 憚霞 R4 Form Kijosama sm Pickled haze layer aluminum anti-cup s4 iFIMI layer Shi-za light input (direction?-11 Gohi J+- Noshi-za Kabuto 8- Sha TK &! II Kichi M-Onaka no Betsuki νKoi part 9--
-8 IF lumbar layer

Claims (1)

【特許請求の範囲】[Claims] 反射膜層と保護膜層との間に、ある温度において突起状
の形状を記憶した形状記憶合金膜層と、剥離性を示す温
度と粘着性を示す温度を有する薄膜層とを備え、形状記
憶合金膜層が記憶した形状へ変化する温度で、かつ、薄
膜層が剥離性を示す温度までレーザ光で加熱することに
より、信号を書き込み、さらに、前記形状記憶合金膜層
が記憶した形状へ変化し、かつ、前記薄膜層が粘着性を
示す温度まで加熱することにより、記録信号を消去する
光ディスク。
Between the reflective film layer and the protective film layer, there is provided a shape memory alloy film layer that memorizes a protruding shape at a certain temperature, and a thin film layer that has a temperature that exhibits peelability and a temperature that exhibits adhesiveness. A signal is written by heating with laser light to a temperature at which the alloy film layer changes to the memorized shape and a temperature at which the thin film layer exhibits peelability, and further, the shape memory alloy film layer changes to the memorized shape. and erasing recorded signals by heating the thin film layer to a temperature at which it becomes sticky.
JP2212836A 1990-08-10 1990-08-10 Optical disk Pending JPH0495241A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2212836A JPH0495241A (en) 1990-08-10 1990-08-10 Optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2212836A JPH0495241A (en) 1990-08-10 1990-08-10 Optical disk

Publications (1)

Publication Number Publication Date
JPH0495241A true JPH0495241A (en) 1992-03-27

Family

ID=16629156

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2212836A Pending JPH0495241A (en) 1990-08-10 1990-08-10 Optical disk

Country Status (1)

Country Link
JP (1) JPH0495241A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004025638A1 (en) * 2002-09-10 2004-03-25 Lg Electronics Inc. Optical disk

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004025638A1 (en) * 2002-09-10 2004-03-25 Lg Electronics Inc. Optical disk
US8151289B2 (en) 2002-09-10 2012-04-03 Lg Electronics Inc. Optical disk having a projection with lateral inclined surface

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